I have a 4040 that I bought and don't know too much about. I know these have a 404 engine from the factory. Mine has the serial # tag upside down on the engine. I was told over the weekend that they do that to combine engines. Is this true? It has a powershift transmission. I have been told that these won't hold up to using them for a pulling tractor. My question is why? I know where there is a 4840 PS putting out 250 HP and has no issues with the tranny. I'm thinking if I can get 250 HP out of that little tractor that would make a heck of a pulling tractor. Anybody tried this?